Nuclear cardiology. Zámbó Katalin Department of Nuclear Medicine
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1 Nuclear cardiology Zámbó Katalin Department of Nuclear Medicine
2 Imaging techniques Morphology Physiology Metabolism Molecules X-ray / CT MRI NM - SPECT/ PET MR spectroscopy fmri Ultrasound Hybrid imaging: SPECT/CT, PET/CT, (PET/MRI)
3 Radioactivity It is the spontaneous disintegration (decay) of the nucleus of a radioactive atom - in which the number of protons and neutrons are not stable - and various type of radiation (, -, +, ) comes out from the nucleus.
4 Number of protons = elemental identity number Number of protons and neutrons = mass number - Atoms with the same number of protons but differing number of neutrons are called isotopes of that element. -The behaviour of the different radioactive isotopes of an atom is the same as the stable form in every conditions. - Using the radioactive material as a tracer (Hevesy György 1923).
5 Rays of radioactive decay Corpuscular rays (, -, + ) Electromagnetic ray ( ) Lead Paper Penetration
6 Gamma radiation - really electromagnetic radiation - physically similar to X-rays, but it comes out from the nucleus of the atom - very penetrated and easily pass trough tissue - SO: it can be detected externally well, it can be used for diagnostics - 99meta-technetium (arteficial)
7 Equipments I. Gamma-camera - it sees the whole entire area below the detector
8 Gamma-camera DIGITAL PICTURE ARE PRINTED NaI CRYSTAL
9 Radionuclide studies - are based on the function of an organ or an organ system - are very sensitive, but aspecific methods - are easily performed - need no any premedication - are not associated with any morbidity and complication
10 Nuclear medicine methods Static examinations (scintigraphy): an optimal time-period after the subject administration is delayed and several photos (or SPECT slices) are made of the organ from different directions Dynamic studies: a frame-serie is stored in the computer from the time of the isotope injection during an optimal time-period of the examined organ function
11 Dynamic studies Follow up the physiological or pathophysiological function of an organ or an organ system by radioactive agents. Gamma-camera-computer system ROI (region of interest) technique Time-activity curves, T maximum, T ½
12 Nuclear cardiology 1. First passage examination 2. Radionuclide ventriculography (RNV), multigated analysis (MUGA) 3. Rest myocardial perfusion study 4. Stress/rest myocardial perfusion study (viability, PET/CT)
13 First passage study The radioactive subject: 99mTc-DTPA (rapid movement from the body through the kidneys) Fast circulation through the heart and the lung Bolus of the injection (rapid administration in a small volume) is important Cardio-pulmonary circulation times, cardiac output, stroke volume Indications: cor pulmonale, primer pulmonary hypertony, myocardial infarction, hyperkinetic circulation, intracardial left-to-right shunt
14 The way of the bolus sup. v. cava right ventricle pulm. artery+lungs left ventricle curves ROIs
15 Time-activity curves and circulation times I. Bolus II. Right ventricle III. Left ventricle IV. Lung periphery PCT: Pulmonary circulation time PAT: Pulmonary arterial time PVT: Pulmonary venous time MTT: Mean transit time PSI=MTT/PCT: Pulmonary stagnation index
16 Report
17 Intracardial left-to-right shunt Bolus: Tmax=0.9 s T25%=5.1 s PCT = 20.4 s MTT = 27.5 s PSI = 1.35 PI = 1.14
18 Radionuclide ventriculography (RNV), or multigated analysis (MUGA) The blood-pool of the heart is labelled by isotope (99mTc-pyrophosphate-RBC), and study is performed in equilibrium Gamma-camera-computer-R wave monitor system synchronizes the acquisition to R wave of ECG EF: ED-ES/ED-BG (LAO 30 projection) Wall-motion is analysed by parametric pictures (LAO 30 and LAO 70 projections) Indications: myocardial infarction, cardiomyopathy
19 A representative cycle cardiac cycles are collected within each R-R interval and an average cycle is generated by computer from ED to ED. 16 or 32 frames are made from this cycle.
20 The ejection fraction curve LAO 30 the chambers are separated well EF = ED-ES/ED-BG (%)
21 Parametric pictures Activity picture: the colours represent the activity of the pixels Amplitude picture: the colours represent the amplitude of the change of the activity of the pixels Phase picture: the colours represent the phase of the change of the activity of the pixels
22 VENTRICULO SZCINTIGRÁFIA EREDMÉNYLAP PÉCSI TUDOMÁNYEGYETEM ÁLTALÁNOS ORVOSTUDOMÁNYI KAR Központi Klinikai Radioizotóp Laboratórium 7624 Pécs, Ifjúság útja 13. Tel.: (72) /1229 Intézetvezető: dr. Zámbó Katalin NORMAL FUNCTION OF THE LEFT VENTRICLE Kódszám: KE0351 Szül.: Beküldô int.: Szigetvár Bel. Diagnosis: St.p.inf.myoc. Értékelte: Dr.Schmidt Dátum: : SZIVKAMRA-GÖRBE ELEMZÉSE EF: 64.1 % ES ideje: 398 ms PER ideje: 180 ms seb.: EDV/s PFR ideje: 550 ms seb.: 2.18 EDV/s PFR/PER: 0.87 Ciklusidö: 944 ms Frekvencia: 64/min Infl. pont: 768 ms Lao30 Lao70
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24
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26 VENTRICULO SZCINTIGRÁFIA EREDMÉNYLAP PÉCSI TUDOMÁNYEGYETEM ÁLTALÁNOS ORVOSTUDOMÁNYI KAR Központi Klinikai Radioizotóp Laboratórium 7624 Pécs, Ifjúság útja 13. Tel.: (72) /1229 Intézetvezető: dr. Zámbó Katalin HUGE PARADOX WALL-MOTION ON THE APEX Kódszám: KE0100 Szül.: Beküldô int.: Komló Bel. Diagnosis: ISZB Értékelte: Dr.Schmidt Dátum: : SZIVKAMRA-GÖRBE ELEMZÉSE EF: 25.2 % ES ideje: 270 ms PER ideje: 137 ms seb.: EDV/s PFR ideje: 392 ms seb.: 1.26 EDV/s PFR/PER: 0.79 Ciklusidö: 592 ms Frekvencia: 101/min Lao30 Lao70
27 SPECT Equipments II. (Single Photon Emission Computer Tomograph)
28 The principle of the SPECT patient The detectors whirl around the patient and makes pictures from different steps. The transversal, sagittal and coronal slices of the organ are reconstruated and reorientated by computer program.
29 Myocardial perfusion imaging in rest The myocardium is labelled by radioactive agent: - 99mTc-MIBI, 99mTc-tetrofosmin: mitochondria - 201Tl-clorid: Na-K pump Reconstruated and reorientated slices are created from the left ventricle by SPECT or SPECT/CT (attenuation correction) The impairment of the myocardial perfusion is indicated by decreased activity or lack of the activity Indications: myocardial infarction
30 The slices of the myocardium made by SPECT
31 The transversal, sagittal and coronal slices of the myocardium
32 Enlarged left ventricle, increased background
33 Septal-basal hypoperfusion + right ventricle Polar map: short-axis circumferential profiles for quantification of tracer uptake in percentage of the reference zone.
34 Septal + infero-septal + antero-septal hypoperfusion
35 Stress/rest myocardial perfusion study Physical or pharmacological stress (Dipyridamol) is applied The isotope is administered at peak of the stress» SPECT-imaging Rest SPECT-imaging is on the same day (Tl), or one day later (Tc-MIBI) Reversible ischaemy: stress/rest mismatch Fixed abnormality (scar): stress/rest match
36 Normal myocardial perfusion
37 CAD in the infero-lateral wall
38 Apical and antero-apical transient ischaemy
39 Transient ischaemy in the basal part of the septum
40 Infero-basal transient ischaemy
41 Hudge infero-lateral transient ischaemia
42 Polar maps, profil-curves
43 Polar maps of reversibility (Emory toolbox)
44 3D (three dimension) imaging
45 Quantitativ evaluation
46 Report
47 Inferior, infero-septal, infero-lateral fix perfusion defect (scar)
48 Inferior, infero-septal, infero-lateral fix perfusion defect (scar)
49 Report (Emory toolbox)
50 Reverse perfusion: is impaired in rest DPD - steal mechanism X syndrom, myocardial bridge
51 Gated examination: quantitativ evaluation of thickening, global and regional EF
52 Equipments III. - SPECT/CT (Single Photon Emission Computer Tomograph) + CT hybrid: multimodality, fused imaging
53 Myocardium perfusion SPECT/CT study in female
54 Influence of attenuation correction of the anterior wall in female Basic AC Basic AC Basic AC
55 Influence of attenuation correction of the inferior wall in male
56 3D SPECT/CT imaging: stenosis of circumflexa hypoperfusion in the apical part of the left ventricle
57 3D SPECT/CT imaging: stenosis of proximal part of the LAD antero-basalis hypoperfusion
58 4. pts LAD, Cx, RCA sten. s i g n i f i c a n c e? Calcium score: LAD Cx RCA MSCT result questionable : high coron. calcification saccular dilatation of coronaries Kerecsen Gábor
59 4. pts Stress MPS - 3D Stress MPS + MSCT Mild ischemia on inferior wall Answer : the ischemia is mild medical therapy Balogh Ildikó
60 4. pts Balogh I. Kerecsen G.
61 Viability examination of the myocardium When similar fix defect is found in stress and rest situation (scar, hibernated, stunned myocardium) to assess the possibility for succesful revascularization. 201Tl-chlorid has a specific redistribution pattern after 3-4 hours in rest, which depends on the wash-out from the myocytes. After the reinjection the activity of the myocardium depends on primarily the perfusion by the coronary arteries.
62 Function Perfusion Metabolisme Stunned Hibernated Reversibile! Revascularization Necrosis (scar) Irreversibile!
63 Viability examination by 201Tl-clorid: stress-redistribution
64 Viability examination by 201Tl-clorid: redistribution-reinjection
65 Viability examination by 201Tl-clorid stress redistr. reinjection
66 +Beta (positron) radiation - too many protons are in the nucleus - its life is very short, when it slows down, it combines with a normal electron in a process known annihilation, which destroyes both the electron and positron and produces two energetic photons each with 511 kev - they are used for PET examinations - isotopes with ultrashort half-life (11C, 15O, 13N, 18F) - e.g. 18Fluor-FDG to study the metabolic changes of the heart, the brain and the various tumors
67 Equipments III. PET/CT (Positron Emission Tomograph/CT)
68 The principle of the PET Computers Annihilation gamma photons Preprocessing Evaluation, printing Ring detectors
69 PET study MIBI-FDG mismatch Perfusionmetabolic match viability of myocardium scar
70 The coronary angiogram was acquired using CT, while the surface of the myocardium is coloured using the data of the ammonia PET stress perfusion scan done during the PET-CT examination. It can be clearly seen that territories in the distal LAD region are blue, which signifies reduced stress perfusion.
71 SPECT/MRI fused imaging
72 Differential diagnosis Intracardial left-to-right shunt, chronic cor pulmonale: first passage study Acut myocardial infarction, myocardial scar, cardiomyopathy: rest myocardial perfusion study radionuclide ventriculography (MUGA) Pectoral angina, coronary artery disease: stress/rest myocardial perfusion study Viability before revascularization: glucose metabolism by PET/CT
73 Thank you!
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